TextEditingTool: Identify the TextBlock (and node)

Hi!
I need to verify that the input that the user inserted is correct. The user can insert data in several nodes (some nodes have several textblocks to user insert data too). I thought to use TextEditingTool to do this but how can i identify each textblock from each node using TextEditingTool? Thanks for your support

Sorry I have found the solution looking for your API reference. I must use the property "this.TextBlock.Name "

public class CustomTextEditingTool : TextEditingTool
{
protected override bool IsValidText(string oldstring, string newstring)
{
switch (this.TextBlock.Name)

<span =“Apple-tab-span” style=“white-space:pre”> …
<span =“Apple-tab-span” style=“white-space:pre”> }
}<span =“Apple-tab-span” style=“white-space:pre”>